The Justice Department in Manhattan is investigating whether Uber illegally used software to track drivers for Lyft, its main ride-hailing competitor, to gain an advantage in attracting and recruiting drivers, according to two people familiar with the probe.

Expedia CEO Dara Khosrowshahi has been named Uber's top executive, taking the difficult job of mending the dysfunctional ride-hailing giant and turning it from money-losing behemoth to a profitable company.

For the second time this month, a federal judge has rejected a challenge to Seattle's first-in-the-nation law allowing drivers of ride-hailing companies such as Uber and Lyft to unionize over pay and working conditions.